Evaluating the Effect of Roadway and Development Factors on the Rural Road Safety Risk Index

Table 3

Final cluster centers for independent and dependent variables in this study.

Final cluster centers
Cluster
Independent variables		1	2	3	4	5	6
	Operating speed	56.66	62.65	91.79	81.80	97.53	88.00
	Difference between posted speed limits and operating speed	−17.34	8.10	41.02	27.77	18.69	-0.75
	Segment length	1.26	1.56	1.90	1.42	1.84	1.56
	Volume	16.42	16.87	15.75	18.95	17.73	18.56
	Presence or absence of a speed control camera	0.00	0.09	0.04	0.03	0.00	0.00
	Homogeneous sections	3.00	3.64	4.43	4.26	3.86	3.67
	Gradient	1.20	1.09	1.07	1.23	1.21	1.22
	Dominant land uses along the roadways land use	1.20	1.27	0.75	0.69	1.29	1.56
	Number of accessibility	0.60	1.36	3.46	2.13	2.93	0.67
Dependent variable	Accident frequency rate	0.80	0.53	0.01	0.12	0.75	1.87